/*
 * (C) APUE
 * use fcntl
 */
#include "apue.h"
#include <fcntl.h>

int main(int argc, char *argv[])
{
	int val;
	if (argc != 2)
		err_quit("usage: a.out <descriptor#>");

	if ((val = fcntl(atoi(argv[1]), F_GETFL, 0)) < 0)
		err_quit("fcntl error for fd %d", atoi(argv[1]));

	switch (val & O_ACCMODE)
	{
		case O_RDONLY:
			printf("read only");
			break;
		case O_WRONLY:
			printf("write only");
			break;
		case O_RDWR:
			printf("read write");
			break;
		default:
			err_quit("unkown access mode");
	}

	if (val & O_APPEND)
		printf(", append");
	if (val & O_NONBLOCK)
		printf(" ,nonblocking");
#if	defined(O_SYNC)
	if (val & O_SYNC)
		printf(", synchronous writes");
#endif
#if	!defined(_POSIX_C_SOURCE) && defined(O_FSYNC)
	if (val & O_FSYNC)
		printf(", synchronous writes");
#endif

	putchar('\n');
	return 0;
}
